ExtJs: TreeLoader: it doesn't work but why?

Question

If I do this : it works :

var myTreeLoader = new Ext.tree.TreeLoader({
        dataUrl: 'json/test.php',
});

If I add this code it doesn't work :

var myTreeLoader = new Ext.tree.TreeLoader({
        dataUrl: 'json/test.php',
        load : function(loader,node,response) { }
 });

My question is : why ? Edit/Delete Message

Answer 1

Well, you are overriding the built-in load() method with an empty implementation. What were you expecting it to do if it can't load data?

Answer 2

Some browers (e.g. IE) won't like the trailing comma after dataUrl. Not sure if that is your problem here, but it's a never ending source of many JS problems.

Answer 3

The correct answer was:

var MyTreeLoader = new Ext.tree.TreeLoader({
    dataUrl: 'json/lys.php',
    listeners: {
        load: function(loader,node,response) {
            console.log('datas loaded');
        }
    }
});

Mr bmoeskau was right. I was overriding a function instead of add a listener.